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<?php

/**

 * RSS Helper class file.

 *

 * Simplifies the output of RSS feeds.

 *

 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)

 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 *

 * Licensed under The MIT License

 * For full copyright and license information, please see the LICENSE.txt

 * Redistributions of files must retain the above copyright notice.

 *

 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 * @link          http://cakephp.org CakePHP(tm) Project

 * @package       Cake.View.Helper

 * @since         CakePHP(tm) v 1.2

 * @license       http://www.opensource.org/licenses/mit-license.php MIT License

 */

App::uses('AppHelper', 'View/Helper');

App::uses('Xml', 'Utility');

/**

 * RSS Helper class for easy output RSS structures.

 *

 * @package       Cake.View.Helper

 * @property      TimeHelper $Time

 * @link http://book.cakephp.org/2.0/en/core-libraries/helpers/rss.html

 */

class RssHelper extends AppHelper {

/**

 * Helpers used by RSS Helper

 *

 * @var array

 */

	public $helpers = array('Time');

/**

 * Base URL

 *

 * @var string

 */

	public $base = null;

/**

 * URL to current action.

 *

 * @var string

 */

	public $here = null;

/**

 * Parameter array.

 *

 * @var array

 */

	public $params = array();

/**

 * Current action.

 *

 * @var string

 */

	public $action = null;

/**

 * POSTed model data

 *

 * @var array

 */

	public $data = null;

/**

 * Name of the current model

 *

 * @var string

 */

	public $model = null;

/**

 * Name of the current field

 *

 * @var string

 */

	public $field = null;

/**

 * Default spec version of generated RSS

 *

 * @var string

 */

	public $version = '2.0';

/**

 * Returns an RSS document wrapped in `<rss />` tags

 *

 * @param array $attrib `<rss />` tag attributes

 * @param string $content Tag content.

 * @return string An RSS document

 * @link http://book.cakephp.org/2.0/en/core-libraries/helpers/rss.html#RssHelper::document

 */

	public function document($attrib = array(), $content = null) {

		if ($content === null) {

			$content = $attrib;

			$attrib = array();

		}

		if (!isset($attrib['version']) || empty($attrib['version'])) {

			$attrib['version'] = $this->version;

		}

		return $this->elem('rss', $attrib, $content);

	}

/**

 * Returns an RSS `<channel />` element

 *

 * @param array $attrib `<channel />` tag attributes

 * @param array $elements Named array elements which are converted to tags

 * @param string $content Content (`<item />`'s belonging to this channel

 * @return string An RSS `<channel />`

 * @link http://book.cakephp.org/2.0/en/core-libraries/helpers/rss.html#RssHelper::channel

 */

	public function channel($attrib = array(), $elements = array(), $content = null) {

		if (!isset($elements['link'])) {

			$elements['link'] = '/';

		}

		if (!isset($elements['title'])) {

			$elements['title'] = '';

		}

		if (!isset($elements['description'])) {

			$elements['description'] = '';

		}

		$elements['link'] = $this->url($elements['link'], true);

		$elems = '';

		foreach ($elements as $elem => $data) {

			$attributes = array();

			if (is_array($data)) {

				if (strtolower($elem) === 'cloud') {

					$attributes = $data;

					$data = array();

				} elseif (isset($data['attrib']) && is_array($data['attrib'])) {

					$attributes = $data['attrib'];

					unset($data['attrib']);

				} else {

					$innerElements = '';

					foreach ($data as $subElement => $value) {

						$innerElements .= $this->elem($subElement, array(), $value);

					}

					$data = $innerElements;

				}

			}

			$elems .= $this->elem($elem, $attributes, $data);

		}

		return $this->elem('channel', $attrib, $elems . $content, !($content === null));

	}

/**

 * Transforms an array of data using an optional callback, and maps it to a set

 * of `<item />` tags

 *

 * @param array $items The list of items to be mapped

 * @param string|array $callback A string function name, or array containing an object

 *     and a string method name

 * @return string A set of RSS `<item />` elements

 * @link http://book.cakephp.org/2.0/en/core-libraries/helpers/rss.html#RssHelper::items

 */

	public function items($items, $callback = null) {

		if ($callback) {

			$items = array_map($callback, $items);

		}

		$out = '';

		$c = count($items);

		for ($i = 0; $i < $c; $i++) {

			$out .= $this->item(array(), $items[$i]);

		}

		return $out;

	}

/**

 * Converts an array into an `<item />` element and its contents

 *

 * @param array $att The attributes of the `<item />` element

 * @param array $elements The list of elements contained in this `<item />`

 * @return string An RSS `<item />` element

 * @link http://book.cakephp.org/2.0/en/core-libraries/helpers/rss.html#RssHelper::item

 */

	public function item($att = array(), $elements = array()) {

		$content = null;

		if (isset($elements['link']) && !isset($elements['guid'])) {

			$elements['guid'] = $elements['link'];

		}

		foreach ($elements as $key => $val) {

			$attrib = array();

			$escape = true;

			if (is_array($val) && isset($val['convertEntities'])) {

				$escape = $val['convertEntities'];

				unset($val['convertEntities']);

			}

			switch ($key) {

				case 'pubDate' :

					$val = $this->time($val);

					break;

				case 'category' :

					if (is_array($val) && !empty($val[0])) {

						foreach ($val as $category) {

							$attrib = array();

							if (is_array($category) && isset($category['domain'])) {

								$attrib['domain'] = $category['domain'];

								unset($category['domain']);

							}

							$categories[] = $this->elem($key, $attrib, $category);

						}

						$elements[$key] = implode('', $categories);

						continue 2;

					} elseif (is_array($val) && isset($val['domain'])) {

						$attrib['domain'] = $val['domain'];

					}

					break;

				case 'link':

				case 'guid':

				case 'comments':

					if (is_array($val) && isset($val['url'])) {

						$attrib = $val;

						unset($attrib['url']);

						$val = $val['url'];

					}

					$val = $this->url($val, true);

					break;

				case 'source':

					if (is_array($val) && isset($val['url'])) {

						$attrib['url'] = $this->url($val['url'], true);

						$val = $val['title'];

					} elseif (is_array($val)) {

						$attrib['url'] = $this->url($val[0], true);

						$val = $val[1];

					}

					break;

				case 'enclosure':

					if (is_string($val['url']) && is_file(WWW_ROOT . $val['url']) && file_exists(WWW_ROOT . $val['url'])) {

						if (!isset($val['length']) && strpos($val['url'], '://') === false) {

							$val['length'] = sprintf("%u", filesize(WWW_ROOT . $val['url']));

						}

						if (!isset($val['type']) && function_exists('mime_content_type')) {

							$val['type'] = mime_content_type(WWW_ROOT . $val['url']);

						}

					}

					$val['url'] = $this->url($val['url'], true);

					$attrib = $val;

					$val = null;

					break;

				default:

					$attrib = $att;

			}

			if ($val !== null && $escape) {

				$val = h($val);

			}

			$elements[$key] = $this->elem($key, $attrib, $val);

		}

		if (!empty($elements)) {

			$content = implode('', $elements);

		}

		return $this->elem('item', (array)$att, $content, !($content === null));

	}

/**

 * Converts a time in any format to an RSS time

 *

 * @param int|string|DateTime $time UNIX timestamp or valid time string or DateTime object.

 * @return string An RSS-formatted timestamp

 * @see TimeHelper::toRSS

 * @link http://book.cakephp.org/2.0/en/core-libraries/helpers/rss.html#RssHelper::time

 */

	public function time($time) {

		return $this->Time->toRSS($time);

	}

/**

 * Generates an XML element

 *

 * @param string $name The name of the XML element

 * @param array $attrib The attributes of the XML element

 * @param string|array $content XML element content

 * @param bool $endTag Whether the end tag of the element should be printed

 * @return string XML

 * @link http://book.cakephp.org/2.0/en/core-libraries/helpers/rss.html#RssHelper::elem

 */

	public function elem($name, $attrib = array(), $content = null, $endTag = true) {

		$namespace = null;

		if (isset($attrib['namespace'])) {

			$namespace = $attrib['namespace'];

			unset($attrib['namespace']);

		}

		$cdata = false;

		if (is_array($content) && isset($content['cdata'])) {

			$cdata = true;

			unset($content['cdata']);

		}

		if (is_array($content) && array_key_exists('value', $content)) {

			$content = $content['value'];

		}

		$children = array();

		if (is_array($content)) {

			$children = $content;

			$content = null;

		}

		$xml = '<' . $name;

		if (!empty($namespace)) {

			$xml .= ' xmlns';

			if (is_array($namespace)) {

				$xml .= ':' . $namespace['prefix'];

				$namespace = $namespace['url'];

			}

			$xml .= '="' . $namespace . '"';

		}

		$bareName = $name;

		if (strpos($name, ':') !== false) {

			list($prefix, $bareName) = explode(':', $name, 2);

			switch ($prefix) {

				case 'atom':

					$xml .= ' xmlns:atom="http://www.w3.org/2005/Atom"';

					break;

			}

		}

		if ($cdata && !empty($content)) {

			$content = '<![CDATA[' . $content . ']]>';

		}

		$xml .= '>' . $content . '</' . $name . '>';

		$elem = Xml::build($xml, array('return' => 'domdocument'));

		$nodes = $elem->getElementsByTagName($bareName);

		if ($attrib) {

			foreach ($attrib as $key => $value) {

				$nodes->item(0)->setAttribute($key, $value);

			}

		}

		foreach ($children as $child) {

			$child = $elem->createElement($name, $child);

			$nodes->item(0)->appendChild($child);

		}

		$xml = $elem->saveXml();

		$xml = trim(substr($xml, strpos($xml, '?>') + 2));

		return $xml;

	}

}